21:17Torque, Basic Introduction, Lever Arm, Moment of Force, Simple Machines & Mechanical AdvantageThe Organic Chemistry Tutor673views
Multiple ChoiceSome trainyards have very large horizontal disks that engines can drive onto, which then rotate to turn the engine around to face the opposite direction. Suppose the train engine is 12 m long and centered at the disk's axis. A 500 N force is applied 5.0 m from the center of the engine, with a rope that makes a 35° angle with the side of the engine. What magnitude torque is being applied to the train engine?377views
Multiple ChoiceModel the propeller of an airplane as a single thin rod, 2.2 m long, with a mass of 80 kg. How much torque is required to bring this propeller from rest to 600 rpm in 2.9 s?600views
Multiple ChoiceYou pull with a 100 N at the edge of a 25 cm long wrench, to tighten a bolt (gold), as shown. The angle shown is 53° . Calculate the torque your force produces on the wrench, about an axis perpendicular to it and through the bolt.1116views14rank2comments
Textbook QuestionOne force acting on a machine part is F = (-5.00 N)i + (4.00 N)j. The vector from the origin to the point where the force is applied is r = (-0.450 m)i +(0.150 m)j. (a) In a sketch, show r, F, and the origin.807views
Textbook QuestionA machinist is using a wrench to loosen a nut. The wrench is 25.0 cm long, and he exerts a 17.0-N force at the end of the handle at 37° with the handle (Fig. E10.7). (a) What torque does the machinist exert about the center of the nut?1090views
Textbook QuestionCalculate the torque (magnitude and direction) about point O due to the force F in each of the cases sketched in Fig. E10.1. In each case, both the force F and the rod lie in the plane of the page, the rod has length 4.00 m, and the force has magnitude F = 10.0 N. (a) 1556views
Textbook QuestionA metal bar is in the xy-plane with one end of the bar at the origin. A force F = 97.00 N)i + (-3.00 N)j is applied to the bar at the point x = 3.00 m, y = 4.00 m. (b) What are the magnitude and direction of the torque with respect to the origin produced by F?1527views
Textbook QuestionA metal bar is in the xy-plane with one end of the bar at the origin. A force F = 97.00 N)i + (-3.00 N)j is applied to the bar at the point x = 3.00 m, y = 4.00 m. (a) In terms of unit vectors i and j, what is the position vector r for the point where the force is applied?1286views1rank
Textbook QuestionA machinist is using a wrench to loosen a nut. The wrench is 25.0 cm long, and he exerts a 17.0-N force at the end of the handle at 37° with the handle (Fig. E10.7). (b) What is the maximum torque he could exert with this force, and how should the force be oriented?686views
Textbook Question(I) A 58-kg person riding a bike puts all her weight on each pedal when climbing a hill. The pedals rotate in a circle of radius 17 cm.(a) What is the maximum torque she exerts?190views
Textbook Question(I) A 58-kg person riding a bike puts all her weight on each pedal when climbing a hill. The pedals rotate in a circle of radius 17 cm.(b) How could she exert more torque?162views
Textbook Question(II) A potter is shaping a bowl on a potter’s wheel rotating at constant angular velocity of 1.6 rev/s (Fig. 10–59). The friction force between her hands and the clay is 1.8 N total.(a) How large is her torque on the wheel, if the diameter of the bowl is 9.0 cm? The moment of inertia of the wheel and the bowl is 0.11 kg • m².<IMAGE>161views
Textbook Question(II) A particle is located at r → ( 5.0î + 3.5ĵ + 6.0k̂)m. A force F→ = (8.0ĵ - 4.0k̂) N acts on it. What is the torque, calculated about the origin?177views
Textbook QuestionForce F = ─10ĵ N is exerted on a particle at 𝓇 = (5î＋5ĵ) m. What is the torque on the particle about the origin?774views
Textbook QuestionIn FIGURE EX12.19, for what value of Xaxle will the two forces provide 1.8 Nm of torque about the axle? 1538views2rank1comments
Textbook Question(II) The bolts on the cylinder head of an engine require tightening to a torque of 95 m • N.(a) If a wrench is 28 cm long, what force perpendicular to the wrench must the mechanic exert at its end?<IMAGE>204views
Textbook Question(II) The bolts on the cylinder head of an engine require tightening to a torque of 95 m • N.(b) If the six-sided bolt head is 15 mm across (Fig. 10–55), estimate the force applied near each of the six points by a wrench.<IMAGE>142views
Textbook Question(II) An engineer estimates that under the most adverse expected weather conditions, the total force on the highway sign in Fig. 11–33 will be F→ = (± 2.4 î - 4.1 ĵ) kN, acting at the cm. What torque does this force exert about the base O?155views
Textbook QuestionA particle of mass m uniformly accelerates as it moves counterclockwise along the circumference of a circle of radius R: r→ = î R cos θ + ĵ R sin θwith θ = ω₀t + (1/2)αt² , where the constants ω₀ and α are the initial angular velocity and angular acceleration, respectively. Determine the object’s tangential acceleration a→_tan and determine the torque acting on the object using (a) τ→=r→×F148views
Textbook Question(II) The origin of a coordinate system is at the center of a wheel which rotates in the xy plane about its axle which is the z axis. A force F = 215 N acts in the xy plane, at a 28.0° angle to the x axis, at the point x = 28.0 cm, y = 33.5 cm. Determine the magnitude and direction of the torque produced by this force about the axis.187views
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